Malicious PDF — malware analysis report

Static analysis result for SHA-256 6687684d2ce09ed8…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 07:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de89810394e09f5714c80de0898618be SHA-1: b19b14a426fa115c26bd32e18a09d3a1ff496bd3 SHA-256: 6687684d2ce09ed8ccc2e02c925ef19e0cc8d45e38c1b339f89fbcac2c6bbb14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various URLs, including one hosted on a compromised CMS upload, suggesting an attempt to obscure the final destination or leverage trusted infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://banghetretunhien.com/media/ftp/file/fademufutovifenisanetef.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd8c16b3b0---39173096112.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/5235382998.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/24165839493.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/39396692982.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/87044987242.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/85367764150.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/jutagenedepakugiliximo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308103377fb---nunirulidu.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/78998485852.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a097f99a026b63f03f7e46ece3f19e3b/36748342506.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/24679257028.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/47635950313.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/96708901903.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab4262d74c---65567218655.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/gibejipusexowejusajesofal.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///30840702570.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/75063025795.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/56108404192.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/93611819872.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/50463537330.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/23963632568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cartoon+photo+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B4 10308 bytes
SHA-256: d287314fdc4a391d9e59ebc3144cb16985efec6c20410e0b335e8ca22dedc98d
font_01_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 18128 bytes
SHA-256: 3628d64121bbae848d18d1b63007090b77d39abc473a843439151cc784537fce
font_02_sfnt_off00011b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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